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Reconciliation of Basic and Diluted Earnings (Loss) Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Earnings Per Share [Abstract]                      
Net income (loss) $ 6,519 $ 1,156 $ 19,521 $ 4,245 $ (42,706) $ 2,407 $ 30,790 $ (46) $ 31,441 $ (9,555) $ 30,156
(Income) loss allocated to non-controlling interests                 (1,235) (246) (1,914)
Net income (loss) allocable to common shares                 $ 30,206 $ (9,801) $ 28,242
Weighted-average shares outstanding—Basic                 73,338,219 52,182,427 36,153,673
Dilutive securities                 261,650   6,601
Weighted-average shares outstanding—Diluted                 73,599,869 52,182,427 36,160,274
Basic $ 0.08 [1] $ 0.02 [1] $ 0.27 [1] $ 0.06 [1] $ (0.61) [1] $ 0.05 [1] $ 0.61 [1]   $ 0.41 $ (0.19) $ 0.78
Diluted $ 0.08 [1] $ 0.02 [1] $ 0.27 [1] $ 0.06 [1] $ (0.61) [1] $ 0.05 [1] $ 0.61 [1]   $ 0.41 $ (0.19) $ 0.78
[1] The summation of quarterly per share amounts do not equal the full year amounts.